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ORLANDO, Fla.—Boston center Glen Davis was diagnosed with a concussion after being shaken up late in the third quarter of Game 5 of the Eastern Conference finals, needing to be held up by referee Joey Crawford to keep from falling.

Davis was struck in face by Orlando center Dwight Howard's elbow, tumbling to the court as play went the other way. Davis tried to get up, only to fall again, and then was clearly dazed when he got to his feet.

He took a few more steps, then staggered toward Crawford, who wrapped his arms around Davis to keep him upright as play stopped with 9.7 seconds left in the period. Davis was tended to on the court for a few minutes, then walked to the Celtics' bench and eventually toward the locker room for evaluation.

The Celtics said he would not return. There was no immediate word on his availability if the series extends to Game 6 on Friday.